I just got a coop yesterday and the roost in there was so big I could hardly get between it and the door to go in. So my question is how much roost space do I need for up to 20 Cochin Bantams? Right now I have 28 of them but I am planning on getting down on some cockerels before winter. And one other question. How many nesting boxes should I provide for about 15 birds? I think there are 8 boxes in there now and am wondering if I should add more?